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WO2006066134A2 - Sequences nucleotidiques et polypeptides codes par celles-ci permettant d'ameliorer la resistance des plantes a la secheresse - Google Patents

Sequences nucleotidiques et polypeptides codes par celles-ci permettant d'ameliorer la resistance des plantes a la secheresse Download PDF

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Publication number
WO2006066134A2
WO2006066134A2 PCT/US2005/045780 US2005045780W WO2006066134A2 WO 2006066134 A2 WO2006066134 A2 WO 2006066134A2 US 2005045780 W US2005045780 W US 2005045780W WO 2006066134 A2 WO2006066134 A2 WO 2006066134A2
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Prior art keywords
seq
nucleotide sequence
plant
nucleic acid
promoter
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PCT/US2005/045780
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English (en)
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WO2006066134A3 (fr
Inventor
Gregory Nadzan
Kenneth A. Feldman
Cory Christensen
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Ceres, Inc.
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Priority to CA002592919A priority Critical patent/CA2592919A1/fr
Priority to AU2005316360A priority patent/AU2005316360A1/en
Priority to BRPI0519520-9A priority patent/BRPI0519520A2/pt
Priority to EP05854483A priority patent/EP1831379A2/fr
Publication of WO2006066134A2 publication Critical patent/WO2006066134A2/fr
Publication of WO2006066134A3 publication Critical patent/WO2006066134A3/fr

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/415—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from plants
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
    • C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
    • C12N15/8271—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance
    • C12N15/8273—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for drought, cold, salt resistance

Definitions

  • the present invention relates to isolated polynucleotides, polypeptides encoded thereby, and the use of those sequences for making transgenic plants with enhanced drought tolerance.
  • Plants are constantly exposed to a variety of biotic (e.g., pathogen infection and insect herbivory) and abiotic (e.g., high or low temperature, drought, flood, anaerobic conditions and salinity) stresses. To survive these challenges, plants have developed elaborate mechanisms to perceive external signals and to manifest adaptive responses with proper physiological and morphological changes (Bohnertet al., 1995). Plants exposed to heat and/or low water or drought conditions typically have low yields of plant material, seeds, fruit and other edible products. Practically all agricultural regions are prone to drought due to climatic variation or socio-economic constraints on water resources. It would, therefore, be of great interest and importance to be able to identify genes that confer drought tolerance to thereby enable one to create transformed plants (such as crop plants) with improved ability to survive water limiting conditions.
  • biotic e.g., pathogen infection and insect herbivory
  • abiotic e.g., high or low temperature, drought, flood, anaerobic conditions and salinity
  • the present invention therefore, relates to isolated polynucleotides, polypeptides encoded thereby, and the use of those sequences for making transgenic plants with enhanced drought tolerance.
  • the present invention also relates to processes for increasing the growth potential in plants under abnormal water conditions, recombinant nucleic acid molecules and polypeptides used for these processes and their uses, as well as to plants themselves.
  • Figure 1 Amino acid sequence alignment of homologues of Lead 68, SEQ ID NO. 1. conserveed regions are enclosed in a box. A consensus sequence is shown below the alignment. [Oil] Figure 2. Amino acid sequence alignment of homologues of Lead 69, SEQ ID NO.
  • the present invention discloses novel isolated nucleic acid molecules, nucleic acid molecules that interfere with these nucleic acid molecules, nucleic acid molecules that hybridize to these nucleic acid molecules, and isolated nucleic acid molecules that encode the same protein due to the degeneracy of the DNA code. Additional embodiments of the present application further include the polypeptides encoded by the isolated nucleic acid molecules of the present invention.
  • the nucleic acid molecules of the present invention comprise: (a) a nucleotide sequence encoding an amino acid sequence that is at least 85% identical to any one of Leads 68, 69, 94 and 95, corresponding to SEQ ID Nos. XX - XX, respectively, (b) a nucleotide sequence that is complementary to any one of the nucleotide sequences according to (a), (c) a nucleotide sequence according to any one of SEQ ID Nos.
  • XXXXXXXXXXXX (d) a nucleotide sequence that is in reverse order of any one of the nucleotide sequences according to (c) when read in the 5 ' to 3 ' direction, (e) a nucleotide sequence able to interfere with any one of the nucleotide sequences according to (a), (f) a nucleotide sequence able to form a hybridized nucleic acid duplex with the nucleic acid according to any one of paragraphs (a) - (e) at a temperature from about 40 0 C to about 48°C below a melting temperature of the hybridized nucleic acid duplex, and (g) a nucleotide sequence encoding any one of amino acid sequences of Leads 68, 69, 94 and 95, corresponding to SEQ ID Nos. XXX,- XXXX, respectively.
  • Additional embodiments of the present invention include those polypeptide and nucleic acid molecule sequences disclosed in SEQ ID NOS: 1-93 and 173-176.
  • the present invention further embodies a vector comprising a first nucleic acid having a nucleotide sequence encoding a plant transcription and/or translation signal, and a second nucleic acid having a nucleotide sequence according to the isolated nucleic acid molecules of the present invention. More particularly, the first and second nucleic acids may be operably linked. Even more particularly, the second nucleic acid may be endogenous to a first organism, and any other nucleic acid in the vector may be endogenous to a second organism.
  • first and second organisms may be different species.
  • a host cell may comprise an isolated nucleic acid molecule according to the present invention. More particularly, the isolated nucleic acid molecule of the present invention found in the host cell of the present invention may be endogenous to a first organism and may be flanked by nucleotide sequences endogenous to a second organism. Further, the first and second organisms may be different species. Even more particularly, the host cell of the present invention may comprise a vector according to the present invention, which itself comprises nucleic acid molecules according to those of the present invention.
  • the isolated polypeptides of the present invention may additionally comprise amino acid sequences that are at least 85% identical to any one of Leads 68, 69, 94 and 95, corresponding to SEQ ID Nos. XX -tXX, respectively.
  • inventions include methods of introducing an isolated nucleic acid of the present invention into a host cell. More particularly, an isolated nucleic acid molecule of the present invention may be contacted to a host cell under conditions allowing transport of the isolated nucleic acid into the host cell. Even more particularly, a vector as described in a previous embodiment of the present invention, may be introduced into a host cell by the same method.
  • the isolated nucleic acid molecule according to the present invention may be contacted with a sample under conditions that permit a comparison of the nucleotide sequence of the isolated nucleic acid molecule with a nucleotide sequence of nucleic acid in the sample. The results of such an analysis may then be considered to determine whether the isolated nucleic acid molecule of the present invention is detectable and therefore present within the sample.
  • a further embodiment of the present invention comprises a plant, plant cell, plant material or seeds of plants comprising an isolated nucleic acid molecule and/or vector of the present invention. More particularly, the isolated nucleic acid molecule of the present invention may be exogenous to the plant, plant cell, plant material or seed of a plant.
  • a further embodiment of the present invention includes a plant regenerated from a plant cell or seed according to the present invention. More particularly, the plant, or plants derived from the plant, plant cell, plant material or seeds of a plant of the present invention preferably has enhanced drought tolerance as compared to a wild-type plant cultivated under identical conditions.
  • the transgenic plant may comprise a first isolated nucleic acid molecule of the present invention, which encodes a protein involved in increased drought tolerance, and a second isolated nucleic acid molecule which encodes a promoter capable of driving expression in plants, wherein the increased drought tolerance component and the promoter are operably linked.
  • the gene conferring increased drought tolerance may be mis-expressed in the transgenic plant of the present invention, and the transgenic plant exhibits an increased drought tolerance as compared to a progenitor plant devoid of the gene, when the transgenic plant and the progenitor plant are cultivated under identical environmental conditions, hi another embodiment of the present invention increased drought tolerance phenotype may be due to the inactivation of a particular sequence, using for example an interfering RNA.
  • a preferred embodiment consists of a plant, plant cell, plant material or seed of a plant according to the present invention which comprises an isolated nucleic acid molecule of the present invention, wherein the plant, or plants derived from the plant, plant cell, plant material or seed of a plant, has increased drought tolerance as compared to a wild-type plant cultivated under identical conditions.
  • Another embodiment of the present invention includes methods of enhancing drought tolerance in plants. More particularly, these methods comprise transforming a plant with an isolated nucleic acid molecule according to the present invention. Preferably, the method is a method of enhancing drought tolerance in the transformed plant, whereby the plant is transformed with a nucleic acid molecule encoding the polypeptide of the present invention.
  • Polypeptides of the present invention include consensus sequences. The consensus sequences are those as shown in Figures 1-4. 2. DEFINITIONS
  • Drought Plant species vary in their capacity to tolerate drought conditions. "Drought” can be defined as the set of environmental conditions under which a plant will begin to suffer the effects of water deprivation, such as decreased stomatal conductance and photosynthesis, decreased growth rate, loss of turgor (wilting), or ovule abortion. For these reasons, plants experiencing drought stress typically exhibit a significant reduction in biomass and yield. Water deprivation may be caused by lack of rainfall or limited irrigation. Alternatively, water deficit may also be caused by high temperatures, low humidity, saline soils, freezing temperatures or water-logged soils that damage roots and limit water uptake to the shoot. Since plant species vary in their capacity to tolerate water deficit, the precise environmental conditions that cause drought stress can not be generalized.
  • drought tolerant plants produce higher biomass and yield than plants that are not drought tolerant under water limited conditions and may also exhibit enhanced survivability and/or delayed desiccation under severely water limited conditions. Differences in physical appearance, recovery and yield can be quantified and statistically analyzed using well known measurement and analysis methods.
  • Functionally Comparable Proteins or Functional Homologs This term describes those proteins that have at least one functional characteristic in common. Such characteristics include sequence similarity, biochemical activity, transcriptional pattern similarity and phenotypic activity. Typically, the functional homologs share some sequence similarity and at least one biochemical function. In addition, functional homologs generally share at least one biochemical and/or phenotypic activity.
  • Functional homologs will give rise to the same characteristic to a similar, but not necessarily to the same degree. Typically, functional homologs give the same characteristics where the quantitative measurement due to one of the comparables is at lest 20% of the other; more typically, between 30 to 40%; even more typically, between 50%-60%; even more typically 70% to 80%; even more typically between 90% to 100%.
  • Heterologous sequences are those that are not operatively linked or are not contiguous to each other in nature.
  • a promoter from corn is considered heterologous to an Arabidopsis coding region sequence.
  • a promoter from a gene encoding a growth factor from corn is considered heterologous to a sequence encoding the corn receptor for the growth factor.
  • Regulatory element sequences such as UTRs or 3' end termination sequences that do not originate in nature from the same gene as the coding sequence originates from, are considered heterologous to said coding sequence.
  • Elements operatively linked in nature and contiguous to each other are not heterologous to each other.
  • these same elements remain operatively linked but become heterologous if other filler sequence is placed between them.
  • the promoter and coding sequences of a corn gene expressing an amino acid transporter are not heterologous to each other, but the promoter and coding sequence of a corn gene operatively linked in a novel manner are heterologous.
  • High Temperature Plant species vary in their capacity to tolerate high temperatures. Very few plant species can survive temperatures higher than 45 0 C. The effects of high temperatures on plants, however, can begin at lower temperatures depending on the species and other environmental conditions such as humidity and soil moisture. "High temperature” can be defined as the temperature at which a given plant species will be adversely affected as evidenced by symptoms such as decreased photosynthesis. Since plant species vary in their capacity to tolerate high temperature, the precise environmental conditions that cause high temperature stress can not be generalized. However, high temperature tolerant plants are characterized by their ability to retain their normal appearance or recover quickly from high temperature conditions. Such high temperature tolerant plants produce higher biomass and yield than plants that are not high temperature tolerant. Differences in physical appearance, recovery and yield can be quantified and statistically analyzed using well known measurement and analysis methods.
  • Low Temperature Plant species vary in their capacity to tolerate low temperatures. Chilling-sensitive plant species, including many agronomically important species, can be injured by cold, above-freezing temperatures. At temperatures below the freezing-point of water most plant species will be damaged. Thus, "low temperature” can be defined as the temperature at which a given plant species will be adversely affected as evidenced by symptoms such as decreased photosynthesis and membrane damage (measured by electrolyte leakage). Since plant species vary in their capacity to tolerate low temperature, the precise environmental conditions that cause low temperature stress can not be generalized. However, low temperature tolerant plants are characterized by their ability to retain their normal appearance or recover quickly from low temperature conditions. Such low temperature tolerant plants produce higher biomass and yield than plants that are not low temperature tolerant.
  • Plant seeds vary considerably hi their ability to germinate under low temperature conditions. Seeds of most plant species will not germinate at temperatures less than 1O 0 C. Once seeds have imbibed water they become very susceptible to disease, water and chemical damage. Seeds that are tolerant to low temperature stress during germination can survive for relatively long periods under which the temperature is too low to germinate. Since plant species vary in their capacity to tolerate low temperature during germination, the precise environmental conditions that cause low temperature stress during germination can not be generalized. However, plants that tolerate low temperature during germination are characterized by their ability to remain viable or recover quickly from low temperature conditions.
  • Such low temperature tolerant plants produce, germinate, become established, grow more quickly and ultimately produce more biomass and yield than plants that are not low temperature tolerant. Differences hi germination rate, appearance, recovery and yield can be quantified and statistically analyzed using well known measurement and analysis methods.
  • misexpression refers to an increase or a decrease in the transcription of a coding region into a complementary RNA sequence as compared to the wild-type. This term also encompasses expression and/or translation of a gene or coding region or inhibition of such transcription and/or translation for a different tune period as compared to the wild-type and/or from a non-natural location within the plant genome, including a gene or coding region from a different plant species or from a non-plant organism.
  • Percentage of sequence identity refers to the degree of identity between any given query sequence and a subject sequence.
  • a query nucleic acid or amino acid sequence is aligned to one or more subject nucleic acid or amino acid sequences using the computer program ClustalW (version 1.83, default parameters), which allows alignments of nucleic acid or protein sequences to be carried out across their entire length (global alignment).
  • ClustalW calculates the best match between a query and one or more subject sequences, and aligns them so that identities, similarities and differences can be determined. Gaps of one or more residues can be inserted into a query sequence, a subject sequence, or both, to maximize sequence alignments.
  • word size 2; window size: 4; scoring method: percentage; number of top diagonals: 4; and gap penalty: 5.
  • gap opening penalty 10.0; gap extension penalty: 5.0; and weight transitions: yes.
  • word size 1; window size: 5; scoring method: percentage; number of top diagonals: 5; gap penalty: 3.
  • weight matrix blosum; gap opening penalty: 10.0; gap extension penalty: 0.05; hydrophilic gaps: on; hydrophilic residues: GIy, Pro, Ser, Asn, Asp, GIn, GIu, Arg, and Lys; residue-specific gap penalties: on.
  • the output is a sequence alignment that reflects the relationship between sequences.
  • ClustalW can be run, for example, at the Baylor College of Medicine Search Launcher site (searchlauncher.bcm.tmc.edu/multi-align/multi-align.html) and at the European Bioinfbrmatics Institute site on the World Wide Web (ebi.ac.uk/clustalw).
  • searchlauncher.bcm.tmc.edu/multi-align/multi-align.html searchlauncher.bcm.tmc.edu/multi-align/multi-align.html
  • European Bioinfbrmatics Institute site on the World Wide Web ebi.ac.uk/clustalw.
  • ClustalW divides the number of identities in the best alignment by the number of residues compared (gap positions are excluded), and multiplies the result by 100.
  • the output is the percent identity of the subject sequence with respect to the query sequence. It is noted that the percent identity value can be rounded to the nearest tenth. For example, 78.11, 78.12, 78.13, and 78.14 are rounded down to 78.1, while 78.15, 78.16, 78.17, 78.18, and 78.19 are rounded up to 78.2.
  • regulatory region refers to nucleotide sequences that, when operably linked to a sequence, influence transcription initiation or translation initiation or transcription termination of said sequence and the rate of said processes, and/or stability and/or mobility of a transcription or translation product.
  • operably linked refers to positioning of a regulatory region and said sequence to enable said influence.
  • Regulatory regions include, without limitation, promoter sequences, enhancer sequences, response elements, protein recognition sites, inducible elements, protein binding sequences, 5' and 3' untranslated regions (UTRs), transcriptional start sites, termination sequences, polyadenylation sequences, and introns. Regulatory regions can be classified in two categories, promoters and other regulatory regions.
  • Stringency is a function of probe length, probe composition (G + C content), and salt concentration, organic solvent concentration, and temperature of hybridization or wash conditions. Stringency is typically compared by the parameter T m , which is the temperature at which 50% of the complementary molecules in the hybridization are hybridized, in terms of a temperature differential from T m . High stringency conditions are those providing a condition of T m - 5 0 C to T m - 1O 0 C. Medium or moderate stringency conditions are those providing T n , - 2O 0 C to T m - 29 0 C. Low stringency conditions are those providing a condition of T n , - 4O 0 C to T m - 48 0 C. The relationship of hybridization conditions to T m (in 0 C) is expressed in the mathematical equation
  • T m 81.5 -16.6(1Og 10 [Na + ]) + 0.41(%G+C) - (600/N) (1)
  • N is the length of the probe. This equation works well for probes 14 to 70 nucleotides in length that are identical to the target sequence.
  • the equation below for T m of DNA-DNA hybrids is useful for probes in the range of 50 to greater than 500 nucleotides, and for conditions that include an organic solvent (fo ⁇ namide).
  • T m 81.5+16.6 log ([Na + ]Z(HOJ[Na + ]))+ 0.41(%G+C)-500/L 0.63(%formamide) (2) where L is the length of the probe in the hybrid.
  • P. Tijessen "Hybridization with Nucleic Acid Probes” in Laboratory Techniques in Biochemistry and Molecular Biology, P.C. vand der Vliet, ed., c. 1993 by Elsevier, Amsterdam.
  • the T n of equation (2) is affected by the nature of the hybrid; for DNA-RNA hybrids T m is 10-15 0 C higher than calculated, for RNA- RNA hybrids T m is 20-25 0 C higher.
  • Equation (2) is derived assuming equilibrium and therefore, hybridizations according to the present invention are most preferably performed under conditions of probe excess and for sufficient time to achieve equilibrium. The time required to reach equilibrium can be shortened by inclusion of a hybridization accelerator such as dextran sulfate or another high volume polymer in the hybridization buffer.
  • a hybridization accelerator such as dextran sulfate or another high volume polymer in the hybridization buffer.
  • Stringency can be controlled during the hybridization reaction or after hybridization has occurred by altering the salt and temperature conditions of the wash solutions used.
  • the formulas shown above are equally valid when used to compute the stringency of a wash solution.
  • Preferred wash solution stringencies lie within the ranges stated above; high stringency is 5-8 0 C below T m , medium or moderate stringency is 26-29 0 C below T m and low stringency is 45-48 0 C below T m .
  • Superpool As used in the context of the current invention, a "superpool" contains an equal amount of seed from 500 different events, representing 100 distinct exogenous nucleotide sequences.
  • An event is a plant carrying a unique insertion of a distinct exogenous sequence which misexpresses that sequence. Transformation of a single nucleotide can result in multiple events because the sequence can insert in a different part of the genome with each transformation.
  • To As used in the current application, the term “To” refers to the whole plant, explant or callus tissue inoculated with the transformation medium.
  • T 1 refers to a unique event which is either the progeny of the T 0 plant, in the case of whole-plant transformation, or the regenerated seedling in the case of explant or callous tissue transformation.
  • T 2 refers to the progeny of the T 1 plant. T 2 progeny are the result of self-fertilization or cross pollination of a T 1 plant.
  • T 3 refers to second generation progeny of the plant that is the direct result of a transformation experiment. T 3 progeny are the result of self-fertilization or cross pollination of a T 2 plant.
  • the polynucleotides and polypeptides of the present invention are of interest because when they are misexpressed (i.e. when expressed at a non-natural location or in an increased or decreased amount) they produce plants with enhanced drought tolerance.
  • “Drought tolerance” is a term that includes various responses to environmental conditions that affect the amount of water available to the plant. For example, under high heat conditions water is rapidly evaporated from both the soil and from the plant itself, resulting in a decrease of available water for maintaining or initiating physiological processes. Likewise, water availability is limited during cold or drought conditions or when there is low water content in the soil. Interestingly, flood conditions also affect the amount of water available to the plant because it damages the roots and thus limits the plant's ability to transport water to the shoot. As used herein, enhancing drought tolerance is intended to encompass all of these situations as well as other environmental situations that affect the plant's ability to use and/or maintain water effectively (e.g. osmotic stress, salinity, etc.).
  • Short term or prolonged drought is one of the major impediments to yield in most non-irrigated fields. Lack of inexpensive water is also one of the major environmental factors in limiting where a crop can be grown. Throughout the Midwestern United States, drought is the primary factor contributing to yield losses year to year. It is recognized that there are a number of times throughout the plant's life cycle where tolerance to drought would be advantageous. Tolerance to drought can be measured in a number of ways including increased leaf vigor at the seedling or whole plant level, recovery from severe drought, increased yield, reduced ovule abortion, increased photosynthetic capacity, relative water content, and increased water potential.
  • the polynucleotides and polypeptides of the invention are useful for enhancing drought tolerance. These traits can be used to exploit or maximize plant products for agriculture, horticulture, biomass for bioconversion and/or forestry purposes in different environment conditions of water supply. Modulating the expression of the nucleotides and polypeptides of the present invention leads to transgenic plants that resist desiccation, require less water and result in better yield in high heat and/or drought conditions, or that have increased tolerance levels for an excess of water and result in better yield in wet conditions. Both categories of transgenic plants lead to reduced costs for the farmer and better yield in their respective environmental conditions.
  • Drought tolerance according to the invention can also be modulated by expressing these genes/polynucleotides under the control of a drought inducible promoter.
  • polypeptides of the present invention and the proteins expressed via translation of these polynucleotides are set forth in the Sequence Listing, specifically SEQ ID Nos. 1-%*.' The Sequence Listing consists of functionally comparable proteins. Polypeptides comprised of a sequence within and defined by one of the consensus sequences can be utilized for the purposes of the invention, namely to make transgenic plants with increased drought tolerance.
  • recombinant DNA constructs are prepared that comprise the polynucleotide sequences of the invention inserted into a vector and that are suitable for transformation of plant cells.
  • the construct can be made using standard recombinant DNA techniques (see, 16) and can be introduced into the plant species of interest by, for example, Agrobacterium-mediated transformation, or by other means of transformation, for example, as disclosed below.
  • the vector backbone may be any of those typically used in the field such as plasmids, viruses, artificial chromosomes, BACs, YACs, PACs and vectors such as, for instance, bacteria-yeast shuttle vectors, lamda phage vectors, T-DNA fusion vectors and plasmid vectors (see, 17-24).
  • the construct comprises a vector containing a nucleic acid molecule of the present invention with any desired transcriptional and/or translational regulatory sequences such as, for example, promoters, UTRs, and 3 ' end termination sequences.
  • Vectors may also include, for example, origins of replication, scaffold attachment regions (SARs), markers, homologous sequences, and introns.
  • the vector may also comprise a marker gene that confers a selectable phenotype on plant cells.
  • the marker may preferably encode a biocide resistance trait, particularly antibiotic resistance, such as resistance to, for example, kanamycin, bleomycin, or hygromycin, or herbicide resistance, such as resistance to, for example, glyphosate, chlorosulfuron or phosphinotricin.
  • antibiotic resistance such as resistance to, for example, kanamycin, bleomycin, or hygromycin
  • herbicide resistance such as resistance to, for example, glyphosate, chlorosulfuron or phosphinotricin.
  • more than one regulatory region may be present in a recombinant polynucleotide, e.g., introns, enhancers, upstream activation regions, transcription terminators, and inducible elements. Thus, more than one regulatory region can be operably linked to said sequence.
  • the translation initiation site of the translational reading frame of said sequence is typically positioned between one and about fifty nucleotides downstream of the promoter.
  • a promoter can, however, be positioned as much as about 5,000 nucleotides upstream of the translation initiation site, or about 2,000 nucleotides upstream of the transcription start site.
  • a promoter typically comprises at least a core (basal) promoter.
  • a promoter also may include at least one control element, such as an enhancer sequence, an upstream element or an upstream activation region (UAR).
  • a suitable enhancer is a cis-regulatory element (-212 to -154) from the upstream region of the octopine synthase (ocs) gene (Fromm et ah, The Plant Cell 1:977-984 (1989)).
  • ocs octopine synthase
  • a basal promoter is the minimal sequence necessary for assembly of a transcription complex required for transcription initiation. Basal promoters frequently include a "TATA box" element that may be located between about 15 and about 35 nucleotides upstream from the site of transcription initiation.
  • Basal promoters also may include a "CCAAT box” element (typically the sequence CCAAT) and/or a GGGCG sequence, which can be located between about 40 and about 200 nucleotides, typically about 60 to about 120 nucleotides, upstream from the transcription start site.
  • CCAAT box typically the sequence CCAAT
  • GGGCG sequence typically the sequence of GGGCG sequence
  • promoters The choice of promoters to be included depends upon several factors, including, but not limited to, efficiency, selectability, inducibility, desired expression level, and cell- or tissue-preferential expression. It is a routine matter for one of skill in the art to modulate the expression of a sequence by appropriately selecting and positioning promoters and other regulatory regions relative to said sequence.
  • Suitable promoters initiate transcription only, or predominantly, in certain cell types.
  • a promoter that is active predominantly in a reproductive tissue e.g., fruit, ovule, pollen, pistils, female gametophyte, egg cell, central cell, nucellus, suspensor, synergid cell, flowers, embryonic tissue, embryo sac, embryo, zygote, endosperm, integument, or seed coat
  • a cell type- or tissue-preferential promoter is one that drives expression preferentially in the target tissue, but may also lead to some expression in other cell types or tissues as well.
  • Methods for identifying and characterizing promoter regions in plant genomic DNA include, for example, those described in the following references: Jordano, et al., Plant Cell, 1 :855-866 (1989); Bustos, et al., Plant Cell, 1 :839-854 (1989); Green, et al., EMBO J. 7, 4035-4044 (1988); Meier, et al, Plant Cell, 3, 309-316 (1991); and Zhang, et al, Plant Physiology 110: 1069-1079 (1996). [060] Examples of various classes of promoters are described below. Some of the promoters indicated below are described in more detail in U.S. Patent Application Ser. Nos.
  • a promoter may meet criteria for one classification based on its activity in one plant species, and yet meet criteria for a different classification based on its activity in another plant species.
  • a 5' untranslated region can be included in nucleic acid constructs described herein.
  • a 5' UTR is transcribed, but is not translated, and lies between the start site of the transcript and the translation initiation codon and may include the +1 nucleotide.
  • a 3' UTR can be positioned between the translation termination codon and the end of the transcript.
  • UTRs can have particular functions such as increasing mRNA stability or attenuating translation. Examples of 3' UTRs include, but are not limited to, polyadenylation signals and transcription termination sequences, e.g., a nopaline synthase termination sequence.
  • Various promoters can be used to drive expression of the genes of the present invention. Nucleotide sequences of such promoters are set forth in SEQ ID NOs: 94-172. Some of them can be broadly expressing promoters, others may be more tissue preferential. [063] A promoter can be said to be "broadly expressing" when it promotes transcription in many, but not necessarily all, plant tissues or plant cells. For example, a broadly expressing promoter can promote transcription of an operably linked sequence in one or more of the shoot, shoot tip (apex), and leaves, but weakly or not at all in tissues such as roots or stems.
  • a broadly expressing promoter can promote transcription of an operably linked sequence in one or more of the stem, shoot, shoot tip (apex), and leaves, but can promote transcription weakly or not at all in tissues such as reproductive tissues of flowers and developing seeds.
  • Non-limiting examples of broadly expressing promoters that can be included in the nucleic acid constructs provided herein include the p326 (SEQ ID NO:), YP0144 (SEQ ID NO:), YP0190 (SEQ ID NO:), pl3879 (SEQ ID NO:), YP0050 (SEQ ID NO:), p32449 (SEQ ID NO:), 21876 (SEQ ID NO:), YP0158 (SEQ ID NO:), YP0214 (SEQ ID NO:), YP0380 (SEQ ID NO:), PT0848 (SEQ ID NO:), PT1026 (SEQ ID NO.
  • CaMV 35S promoter the cauliflower mosaic virus (CaMV) 35S promoter
  • MAS mannopine synthase
  • figwort mosaic virus 34S promoter actin promoters such as the rice actin promoter
  • ubiquitin promoters such as the maize ubiquitin-1 promoter.
  • the CaMV 35S promoter is excluded from the category of broadly expressing promoters.
  • Root-active promoters drive transcription in root tissue, e.g., root endodermis, root epidermis, or root vascular tissues.
  • root-active promoters are root- preferential promoters, i.e., drive transcription only or predominantly in root tissue.
  • Root- preferential promoters include the YP0128 (SEQ ID NO: XX), YP0275 (SEQ ID NO: XX), PT0625 (SEQ ID NO: XX), PT0660 (SEQ ID NO: XX), PT0683 (SEQ ID NO: XX), and PT0758 (SEQ ID NO: XX).
  • root-preferential promoters include the PT0613 (SEQ ID NO: JXX), PT0672 (SEQ ID NO: XX), PT0688 (SEQ ID NO: XX), and PT0837 (SEQ ID NO: XX), which drive transcription primarily in root tissue and to a lesser extent in ovules and/or seeds.
  • Other examples of root-preferential promoters include the root-specific subdomains of the CaMV 35S promoter (Lam et ah, Proc. Natl. Acad. ScL USA 86:7890- 7894 (1989)), root cell specific promoters reported by Conkling et ah, Plant Physiol. 93:1203-1211 (1990), and the tobacco RD2 gene promoter.
  • promoters that drive transcription in maturing endosperm can be useful. Transcription from a maturing endosperm promoter typically begins after fertilization and occurs primarily in endosperm tissue during seed development and is typically highest during the cellularization phase. Most suitable are promoters that are active predominantly in maturing endosperm, although promoters that are also active in other tissues can sometimes be used.
  • Non-limiting examples of maturing endosperm promoters that can be included in the nucleic acid constructs provided herein include the napin promoter, the Arcelin-5 promoter, the phaseolin gene promoter (Bustos et ah, Plant Cell l(9):839-853 (1989)), the soybean trypsin inhibitor promoter (Riggs et ah, Plant Cell l(6):609-621 (1989)), the ACP promoter (Baerson et ah, Plant MoI Biol, 22(2):255-267 (1993)), the stearoyl-ACP desaturase gene (Slocombe et ah, Plant Physiol 104(4): 167- 176 (1994)), the soybean ⁇ ' subunit of ⁇ -conglycinin promoter (Chen et al, Proc Natl Acad Sci USA 83:8560-8564 (1986)), the oleosin promoter (Hong et al, Plant MoI
  • Osgt- 1 promoter from the rice glutelin-1 gene (Zheng et al, MoI Cell Biol 13:5829-5842 (1993)), the beta-amylase gene promoter, and the barley hordein gene promoter.
  • Other maturing endosperm promoters include the YP0092 (SEQ ID NO: XX), PT0676 (SEQ ID NO: XX), and PT0708 (SEQ ID NO: XX).
  • Promoters that drive transcription in ovary tissues such as the ovule wall and mesocarp can also be useful, e.g., a polygalacturonidase promoter, the banana TRX promoter, and the melon actin promoter.
  • promoters that drive gene expression preferentially in ovules are YP0007 (SEQ ID NO: XX), YPOl 11 (SEQ ID NO: XX), YP0092 (SEQ ID NO: XX), YP0103 (SEQ ID NO: XX), YP0028 (SEQ ID NO: XX), YP0121 (SEQ ID NO: XX), YP0008 (SEQ ID NO: XX), YP0039 (SEQ ID NO: XX), YPOl 15 (SEQ ID NO: XX), YPOl 19 (SEQ ID NO: XX), YP0120 (SEQ ID NO: XX)andYP0374 (SEQ ID NO: XX).
  • embryo sac/early endosperm promoters can be used in order drive transcription of the sequence of interest in polar nuclei and/or the central cell, or in precursors to polar nuclei, but not in egg cells or precursors to egg cells. Most suitable are promoters that drive expression only or predominantly in polar nuclei or precursors thereto and/or the central cell.
  • a pattern of transcription that extends from polar nuclei into early endosperm development can also be found with embryo sac/early endosperm-preferential promoters, although transcription typically decreases significantly in later endosperm development during and after the cellularization phase. Expression in the zygote or developing embryo typically is not present with embryo sac/early endosperm promoters.
  • Promoters that may be suitable include those derived from the following genes: Arabidopsis viviparous-1 (see, GenBankNo. U93215); Arabidopsis atmycl (see, Urao (1996) Plant MoI Biol, 32:571-57; Conceicao (1994) Plant, 5:493-505); Arabidopsis FIE (GenBank No. AF129516); Arabidopsis MEA; Arabidopsis FIS2 (GenBankNo. AF096096); and FIE 1.1 (U.S. Patent 6,906,244).
  • Arabidopsis viviparous-1 see, GenBankNo. U93215
  • Arabidopsis atmycl see, Urao (1996) Plant MoI Biol, 32:571-57; Conceicao (1994) Plant, 5:493-505
  • Arabidopsis FIE GeneBank No. AF129516
  • Arabidopsis MEA Arabidopsis FIS2
  • FIE 1.1
  • promoters that may be suitable include those derived from the following genes: maize MACl (see, Sheridan (1996) Genetics, 142:1009-1020); maize Cat3 (see, GenBankNo. L05934; Abler (1993) Plant MoI Biol, 22:10131-1038).
  • promoters include the following Arabidopsis promoters: YP0039 (SEQ ID NO: XX), YPOlOl (SEQ ID NO: XX), YP0102 (SEQ ID NO: XX), YPOIlO (SEQ ID NO: XX), YPOl 17 (SEQ ID NO: XX), YPOl 19 (SEQ ID NO: XX), YP0137 (SEQ ID NO: XX), DME, YP0285 (SEQ ID NO: XX), and YP0212 (SEQ ID NO: 90).
  • Other promoters that may be useful include the following rice promoters: p530cl0, pOsFIE2-2, pOsMEA, pOsYpl02, and pOsYp285.
  • Promoters that preferentially drive transcription in zygotic cells following fertilization can provide embryo-preferential expression and may be useful for the present invention. Most suitable are promoters that preferentially drive transcription in early stage embryos prior to the heart stage, but expression in late stage and maturing embryos is also suitable.
  • Embryo-preferential promoters include the barley lipid transfer protein (Ltpl) promoter (Plant Cell Rep (2001) 20:647-654, YP0097 (SEQ ID NO: XX), YP0107 (SEQ ID NO: XX), YP0088 (SEQ ID NO: XX) 5 YP0143 (SEQ ID NO: XX), YPOl 56 (SEQ ID NO: XX), PT0650 (SEQ ID NO: XX), PT0695 (SEQ ID NO: XX), PT0723 (SEQ ID NO: XX), PT0838 (SEQ ID NO: XX) 3 PT0879 (SEQ ID NO: XX) and PT0740 (SEQ ID NO: XX).
  • Ltpl barley lipid transfer protein
  • YP0097 SEQ ID NO: XX
  • YP0107 SEQ ID NO: XX
  • YP0088 S
  • Promoters active in photosynthetic tissue in order to drive transcription in green tissues such as leaves and stems are of particular interest for the present invention. Most suitable are promoters that drive expression only or predominantly in such tissues. Examples of such promoters include the ribulose-l,5-bisphosphate carboxylase (RbcS) promoters such as the RbcS promoter from eastern larch (Larix laricin ⁇ ), the pine cab6 promoter (Yamamoto et ah, Plant Cell Physiol. 35:773-778 (1994)), the Cab-1 gene promoter from wheat (Fejes et ah, Plant MoL Biol.
  • RbcS ribulose-l,5-bisphosphate carboxylase
  • promoters that drive transcription in stems, leafs and green tissue are PT0535 (SEQ ID NO: XX), PT0668 (SEQ ID NO: XX), PT0886 (SEQ ID NO: XX), PR0924 (SEQ ID NO: XX), YP0144 (SEQ ID NO: XX), YP0380 (SEQ ID NO: XX) and PT0585 (SEQ ID NO: XX).
  • inducible promoters may be desired.
  • Inducible promoters drive transcription in response to external stimuli such as chemical agents or environmental stimuli.
  • external stimuli such as chemical agents or environmental stimuli.
  • inducible promoters can confer transcription in response to hormones such as giberellic acid or ethylene, or in response to light or drought.
  • drought inducible promoters examples include YP0380 (SEQ ID NO: XX), PT0848 (SEQ ID NO: XX), YP0381 (SEQ ID NO: XX), YP0337 (SEQ ID NO: XX), YP0337 (SEQ ID NO: XX), PT0633 (SEQ ID NO: XX), YP0374 (SEQ ID NO: XX), PT0710 (SEQ ID NO: XX), YP0356 (SEQ ID NO: XX), YP0385 (SEQ ID NO: XX), YP0396 (SEQ ID NO: XX), YP0384 (SEQ ID NO: XX), YP0384 (SEQ ID NO: XX) 5 PT0688 (SEQ ID NO: XX) 5 YP0286 (SEQ ID NO: XX), YP0377 (SEQ ID NO: XX), PD1367 (SEQ
  • DRE- containing (dehydration-responsive elements) promoters such as DREBl (Liu et al, Cell 10: 1391 (1998)).
  • DRE-containing (dehydration-responsive elements) promoters such as DREBl (Liu et al, Cell 10: 1391 (1998)).
  • promoters induced by nitrogen are PT0863 (SEQ ID NO: XX), PT0829 (SEQ ID NO: XX) 5 PT0665 (SEQ ID NO: XX) and PT0886 (SEQ ID NO: XX).
  • An example of a shade inducible promoter is PR0924.
  • Promoters include, but are not limited to, leaf- preferential, stem/shoot-preferential, callus-preferential, guard cell-preferential, such as PT0678 (SEQ ID NO: XX) 5 and senescence-preferential promoters.
  • misexpression can be accomplished using a two component system, whereby the first component consists of a transgenic plant comprising a transcriptional activator operatively linked to a promoter and the second component consists of a transgenic plant that comprise a nucleic acid molecule of the invention operatively linked to the target- binding sequence/region of the transcriptional activator.
  • the two transgenic plants are crossed and the nucleic acid molecule of the invention is expressed in the progeny of the plant.
  • the misexpression can be accomplished by having the sequences of the two component system transformed in one transgenic plant line.
  • Another alternative consists in inhibiting expression of a drought-tolerance polypeptide in a plant species of interest.
  • expression refers to the process of converting genetic information encoded in a polynucleotide into RNA through transcription of the polynucleotide ⁇ i.e., via the enzymatic action of an RNA polymerase), and into protein, through translation of mRNA.
  • Up-regulation or “activation” refers to regulation that increases the production of expression products relative to basal or native states
  • down-regulation or “repression” refers to regulation that decreases production relative to basal or native states.
  • RNAi interfering RNA
  • Antisense technology is one well-known method. In this method, a nucleic acid segment from the endogenous gene is cloned and operably linked to a promoter so that the antisense strand of RNA is transcribed. The recombinant vector is then transformed into plants, as described above, and the antisense strand of RNA is produced.
  • the nucleic acid segment need not be the entire sequence of the endogenous gene to be repressed, but typically will be substantially identical to at least a portion of the endogenous gene to be repressed. Generally, higher homology can be used to compensate for the use of a shorter sequence. Typically, a sequence of at least 30 nucleotides is used (e.g., at least 40, 50, 80, 100, 200, 500 nucleotides or more).
  • an isolated nucleic acid provided herein can be an antisense nucleic acid to one of the aforementioned nucleic acids encoding a drought-tolerance polypeptide.
  • a nucleic acid that decreases the level of a transcription or translation product of a gene encoding a drought-tolerance polypeptide is transcribed into an antisense nucleic acid similar or identical to the sense coding sequence of the drought-tolerance polypeptide.
  • the transcription product of an isolated nucleic acid can be similar or identical to the sense coding sequence of a drought-tolerance polypeptide, but is an RNA that is unpolyadenylated, lacks a 5' cap structure, or contains an unsplicable nitron.
  • a nucleic acid in another method, can be transcribed into a ribozyme, or catalytic RNA, that affects expression of an rnRNA.
  • Ribozymes can be designed to specifically pair with virtually any target RNA and cleave the phosphodiester backbone at a specific location, thereby functionally inactivating the target RNA.
  • Heterologous nucleic acids can encode ribozymes designed to cleave particular niRNA transcripts, thus preventing expression of a polypeptide.
  • Hammerhead ribozymes are useful for destroying particular mRNAs, although various ribozymes that cleave mRNA at site-specific recognition sequences can be used. Hammerhead ribozymes cleave mRNAs at locations dictated by flanking regions that form complementary base pairs with the target mRNA. The sole requirement is that the target RNA contain a 5'-UG-3' nucleotide sequence.
  • the construction and production of hammerhead ribozymes is known hi the art. See, for example, U.S. Patent No. 5,254,678 and WO 02/46449 and references cited therein.
  • RNA endoribonucleases such as the one that occurs naturally hi Tetrahymena thermophila, and which have been described extensively by Cech and collaborators can be useful. See, for example, U.S. Patent No. 4,987,071.
  • RNA interference is a cellular mechanism to regulate the expression of genes and the replication of viruses. This mechanism is thought to be mediated by double-stranded small interfering RNA molecules. A cell responds to such a double-stranded RNA by destroying endogenous mRNA having the same sequence as the double-stranded RNA.
  • Methods for designing and preparing interfering RNAs are known to those of skill in the art; see, e.g., WO 99/32619 and WO 01/75164. For example, a construct can be prepared that includes a sequence that is transcribed into an interfering RNA.
  • Such an RNA can be one that can anneal to itself, e.g., a double stranded RNA having a stem-loop structure.
  • One strand of the stem portion of a double stranded RNA comprises a sequence that is similar or identical to the sense coding sequence of the polypeptide of interest, and that is from about 10 nucleotides to about 2,500 nucleotides hi length.
  • the length of the sequence that is similar or identical to the sense coding sequence can be from 10 nucleotides to 500 nucleotides, from 15 nucleotides to 300 nucleotides, from 20 nucleotides to 100 nucleotides, or from 25 nucleotides to 100 nucleotides.
  • the other strand of the stem portion of a double stranded RNA comprises an antisense sequence of the biomass-modulating polypeptide of interest, and can have a length that is shorter, the same as, or longer than the corresponding length of the sense sequence.
  • the loop portion of a double stranded RNA can be from 10 nucleotides to 5,000 nucleotides, e.g., from 15 nucleotides to 1,000 nucleotides, from 20 nucleotides to 500 nucleotides, or from 25 nucleotides to 200 nucleotides.
  • the loop portion of the RNA can include an nitron. See, e.g., WO 99/53050.
  • nucleic-acid based methods for inhibition of gene expression in plants can be a nucleic acid analog.
  • Nucleic acid analogs can be modified at the base moiety, sugar moiety, or phosphate backbone to improve, for example, stability, hybridization, or solubility of the nucleic acid. Modifications at the base moiety include deoxyuridine for deoxythymidine, and 5-methyl-2'-deoxycytidine and 5-bromo-2'- deoxycytidine for deoxycytidine. Modifications of the sugar moiety include modification of the 2' hydroxyl of the ribose sugar to form 2'-O-methyl or 2'-O-allyl sugars.
  • the deoxyribose phosphate backbone can be modified to produce morpholino nucleic acids, in which each base moiety is linked to a six-membered morpholino ring, or peptide nucleic acids, in which the deoxyphosphate backbone is replaced by a pseudopeptide backbone and the four bases are retained. See, for example, Summerton and Weller, 1997, Antisense Nucleic Acid Drug Dev., 7:187-195; Hyrup etal, 1996, Bioorgan. Med. Chem., 4: 5-23.
  • the deoxyphosphate backbone can be replaced with, for example, a phosphorothioate or phosphorodithioate backbone, a phosphoroamidite, or an alkyl phosphotriester backbone.
  • Nucleic acid molecules of the present invention may be introduced into the genome or the cell of the appropriate host plant by a variety of techniques. These techniques, able to transform a wide variety of higher plant species, are well known and described hi the technical and scientific literature (see, e.g., 28-29).
  • microinjection 31
  • electroporation of DNA 32
  • PEG 33
  • biolistics 34
  • fusion of cells or protoplasts 35
  • T-DNA T-DNA using Agrobacterium tumefaciens (36-37) or Agrobacterium rhizogenes (38) or other bacterial hosts (39), for example.
  • Seeds are obtained from the transformed plants and used for testing stability and inheritance. Generally, two or more generations are cultivated to ensure that the phenotypic feature is stably maintained and transmitted.
  • nucleic acid molecules of the present invention may be used to confer the trait of increased drought-tolerance.
  • nucleic acid molecules of the present invention encode appropriate proteins from any organism, but are preferably found in plants, fungi, bacteria or animals.
  • the methods according to the present invention can be applied to any plant, preferably higher plants, pertaining to the classes of Angiospermae and Gymnospermae. Plants of the subclasses of the Dicotylodenae and the Monocotyledonae are particularly suitable.
  • the methods of the present invention are preferably used in plants that are important or interesting for agriculture, horticulture, biomass for bioconversion and/or forestry.
  • Non- limiting examples include, for instance, tobacco, oilseed rape, sugar beet, potatoes, tomatoes, cucumbers, peppers, beans, peas, citrus fruits, avocados, peaches, apples, pears, berries, plumbs, melons, eggplants, cotton, soybean, sunflowers, roses, poinsettia, petunia, guayule, cabbages, spinach, alfalfa, artichokes, sugarcane, mimosa, Servicea lespedera, corn, wheat, rice, rye, barley, sorghum and grasses such as switch grass, giant reed, Bermuda grass, Johnson grass or turf grasses, millet, hemp, bananas, poplars, eucalyptus trees and conifers.
  • amino acids in a sequence can be substituted with other amino acid(s), the charge and polarity of which are similar to that of the substituted amino acid, i.e. a conservative amino acid substitution, resulting in a biologically/functionally silent change.
  • Conservative substitutes for an amino acid within the polypeptide sequence can be selected from other members of the class to which the amino acid belongs.
  • Amino acids can be divided into the following four groups: (1) acidic (negatively charged) amino acids, such as aspartic acid and glutamic acid; (2) basic (positively charged) amino acids, such as arginine, histidine, and lysine; (3) neutral polar amino acids, such as serine, threonine, tyrosine, asparagine, and glutamine; and (4) neutral nonpolar (hydrophobic) ammo acids such as glycine, alanine, leucine, isoleucine, valine, proline, phenylalanine, tryptophan, cysteine, and methionine.
  • Nucleic acid molecules of the present invention can comprise sequences that differ from those encoding a protein or fragment thereof selected from the group consisting of [leads 68, 69, 94 and 95, nucleotides] due to the fact that the different nucleic acid sequence encodes a protein having one or more conservative amino acid changes.
  • Bioly functional equivalents of the polypeptides, or fragments thereof, of the present invention can have about 10 or fewer conservative amino acid changes, more preferably about 7 or fewer conservative amino acid changes, and most preferably about 5 or fewer conservative amino acid changes, hi a preferred embodiment of the present invention, the polypeptide has between about 5 and about 500 conservative changes, more preferably between about 10 and about 300 conservative changes, even more preferably between about 25 and about 150 conservative changes, and most preferably between about 5 and about 25 conservative changes or between 1 and about 5 conservative changes.
  • Wild-type Arabidopsis thaliana WassilewsMja (WS) plants are transformed with Ti plasmids containing clones in the sense orientation relative to the 35S promoter.
  • a Ti plasmid vector useful for these constructs, CRS 338 contains the Ceres-constructed, plant selectable marker gene phosphinothricin acetyltransferase (PAT), which confers herbicide resistance to transformed plants.
  • PAT phosphinothricin acetyltransferase
  • Planting Using a 60 mL syringe, 35 mL of the seed mixture is aspirated. 25 drops are added to each pot. Clear propagation domes are placed on top of the pots that are then placed under 55% shade cloth and subirrigated by adding 1 inch of water. [096] Plant Maintenance: 3 to 4 days after planting, lids and shade cloth are removed. Plants are watered as needed. After 7-10 days, pots are thinned to 20 plants per pot using forceps. After 2 weeks, all plants are subirrigated with Peters fertilizer at a rate of 1 Tsp per gallon of water. When bolts are about 5-10 cm long, they are clipped between the first node and the base of stem to induce secondary bolts. Dipping infiltration is performed 6 to 7 days after clipping.
  • Agrobacterium starter blocks are obtained (96-well block with Agrobacterium cultures grown to an OD 60O of approximately 1.0) and inoculated one culture vessel per construct by transferring 1 mL from appropriate well in the starter block. Cultures are then incubated with shaking at 27°C. Cultures are spun down after attaining an OD 6 oo of approximately 1.0 (about 24 hours). 200 mL infiltration media is added to tesuspend Agrobacterium pellets. Infiltration media is prepared by adding 2.2 g MS salts, 50 g sucrose, and 5 ⁇ l 2 mg/ml benzylarninopurine to 900 ml water.
  • nucleotide sequences of the invention are identified by use of a variety of screens that modify water conditions. These screens are recognized by those skilled in the art to be predictive of nucleotide sequences that provide plants with enhanced drought tolerance including improved tolerance to heat and/or low water conditions because they emulate the different environmental conditions that can result from increased heat and/or low water conditions. These screens generally fall into two categories (1) soil screens and (2) in vitro screens.
  • Soil screens have the advantage of assaying the response of the entire plant to particular conditions, such as drought or high heat.
  • in vitro screens have the advantage of relying on defined media and so allow more defined manipulation of growth conditions.
  • Some "surrogate" in vitro screens decrease the water available to the plant by adding particular chemicals to the growth media, such as mannitol or polyethylene glycol (PEG) (e.g., Quesada et al. (2000) Genetics 154:421-36; van der Weele et al. (2000) J Exp. Bot. 51:1555-1562). The decrease in the osmotic potential of the growth media mimics conditions plants experience in dry soil.
  • PEG polyethylene glycol
  • ABA abscisic acid
  • ABA is a plant hormone that is a key regulator of environmental stress responses.
  • ABA-mediated signaling controls the expression of some stress-responsive genes and regulates the closing of stomata in response to water deficit.
  • Screens in the presence of ABA can identify plants with altered stress responses and are useful for identifying plants with increased drought tolerance (Shinozaki et al. (2003) Curr. Opin. Plant Biol 6:410-417).
  • the soil screens and in vitro screens used to identify the polynucleotides and polypeptides of the invention are described in more detail below.
  • these screens are conducted using superpools o ⁇ Arabidopsis T 2 transformed plants.
  • the Ti plants are transformed with a Ti plasmid containing a particular nucleotide sequence in the sense orientation relative to a constitutive promoter and harboring the plant-selectable marker gene phosphinothricin acetyltransferase (PAT), which confers herbicide resistance to transformed plants, specifically to the herbicide FinaleTM (Hoechst).
  • PAT plant-selectable marker gene phosphinothricin acetyltransferase
  • Each superpool is comprised of T 2 seeds from approximately 5 independent transformation events for each of 100 different transgenes. For all screens, seeds from multiple superpools are tested. The results of the screens conducted for each polynucleotide can be found in the Examples below.
  • Mannitol media consists of 375 mM mannitol, 0.5% (w/v) sucrose, 0.025% (w/v) MES hydrate, 0.5x Murashige and Skoog (MS) salts, and 0.6% (w/v) phytagar. Approximately 1200 seeds per Superpool are evenly spread on a mannitol plate and then grown at 22 0 C for 14 days.
  • Putative mannitol-resistant seedlings are transferred to mannitol-free media for recovery. Approximately one week later, these seedlings are transferred to soil and sprayed with Finale to select for transgenic plants. The transgene present in the Finale -resistant plants is determined by PCR. Unpooled T 2 seeds and T 3 seeds from the original transgenic line are retested on 375 mM mannitol media.
  • PEG media consists of 20% PEG 8000, 0.5% (w/v) sucrose, 0.025% (w/v) MES hydrate, 0.5x MS salts and 0.3% (w/v) geh ⁇ te. Approximately 1200 seeds per Superpool are evenly spread on a PEG plate and then grown at 22 0 C for 14 days.
  • ABA media consists of 1.5 ⁇ M ABA, 0.5% (w/v) sucrose, 0.05% (w/v) MES hydrate,
  • FinaleTM One week later, resistant seedlings are transferred to soil.
  • the transgene present in the FinaleTM-resistant plants is determined by PCR. Unpooled T 2 seeds and T 3 seeds from the original transgenic line are retested on 20% PEG media.
  • Soil drought screens identify plants with enhanced tolerance to drought (desiccation tolerance) and enhanced recovery after drought.
  • the humidity dome is removed after approximately 4 days in the greenhouse and flats are watered as needed. At 10 days, plants are sprayed with FinaleTM to eliminate any that are non-transgenic. When 90% of the plants boltd, water is witheld and pots are removed from the flat to promote uniform drying. After approximately 5 days of drying, plants are assessed for desiccation tolerance. Subsequently the flats are rewatered and plants are allowed to recover for several days and then assessed for recovery from desiccation. Tissue from plants exhibiting desiccation tolerance or enhanced recovery is harvested and subjected to PCR to determine the identity of the transgene. T 2 seeds from the original transgenic line are retested hi the Soil Drought Pre- Validation Assay.
  • Seeds are planted in 72-pot flats using 12 pots for each transgenic event to be evaluated and 12 pots of wild-type control. Flats are watered and covered with a plastic humidity dome then placed in the dark at 4 0 C for 3 days. After cold treatment, the flats are moved to the growth chamber (16:8 hour light: dark cycle; 150 ⁇ Einstein; 70% relative humidity; 22 0 C).
  • the humidity domes are removed after approximately 3 days at 22 0 C or when the cotyledens are fully expanded. Seedlings are thinned such that only one seedling remained in each pot. Flats are irrigated alternatively with 0.5 x Hoagland's Solution and filtered water as needed. Twelve days after sowing, the flats are watered for the last time. Plants are scored as drought-tolerant or non-drought-tolerant after approximately 12-16 days of drying. Events showing a significant number of tolerant plants are advanced to the Soil Drought Assay — Desiccation Tolerance. (c) Soil Drought Assay-Desiccation Tolerance
  • Seeds are planted in 24-pot flats containing prepared soil. Flats are watered and covered with a plastic humidity dome then placed in the dark at 4 0 C for 3 days. After cold treatment, the flats re moved to the growth chamber (16:8 hour light: dark cycle; 150 ⁇ Einstein; 70% relative humidity; 22 0 C).
  • the humidity domes are removed after 5 days at 22 0 C or when the cotyledens are fully expanded. On the 5 day, seedlings are thinned such that only one seedling remained in each pot. Flats are irrigated alternatively with 0.5 x Hoagland's Solution and filtered water as needed.
  • Example 1 Lead 94 - ME04218 - Clone 15450 - cDNA 14297769
  • ME04218 was identified from a superpool screen for desiccation tolerance. [0122] Superpool 29 was screened for plants that resisted wilting by testing them for drought tolerance as described above. Twelve candidates were chosen from Superpool 29. All were successfully sequenced. ME04218 was represented once in this set. The gene corresponding to Clone 15450 is upregulated in geminating seeds and reproductive tissues including: flowers, pollen and siliques.
  • a T is transgenic and N is non-transgenic b
  • Expected number of tolerant plants for the null hypothesis is calculated by multiplying the total number of plants (tolerant plus non-tolerant) with the frequency of tolerant plants among the combined non-transgenics 0
  • Expected number of non-tolerant plants for the null hypothesis is calculated by multiplying the total number of plants (tolerant plus non-tolerant) with the frequency of non-tolerant plants among the combined non- transgenics
  • the second assay was performed because the T 3 seeds for Event -01 were not available when the first assay was run. Events -02 and -04 were repeated for controls.
  • ME01466 was identified from superpool screens for PEG and Mannitol tolerance.
  • T transgenic and N is non-transgenic
  • N non-transgenic
  • Expected number of tolerant plants for the null hypothesis is calculated by multiplying the total number of plants (tolerant plus non-tolerant) with the frequency of tolerant plants among the combined non-transgenics
  • Expected number of non-tolerant plants for the null hypothesis is calculated by multiplying the total number of plants (tolerant plus non-tolerant) with the frequency of non-tolerant plants among the combined non- transgenics
  • Significant p-values are in bold type.
  • Event -04 also segregated 3:1 (R: S) for FinaleTM resistance in the T 2 generation.
  • Event -03 not included in this study, exhibited a larger rosette, increased branches and lanceolate shaped leaves.
  • the physical appearance of the remaining 19 T 1 plants was identical to the controls; there are 20 Events because the construct was introduced into the ME pipeline on two different occasions.
  • Table 2-3 summarizes the results of the above experiments from ME 01466/clone 26365, showing enhanced dessication tolerance on soil, and improved seeding vigor and growth in PEG and mannitol.
  • Table 2-3 Summar of Results for ME 01466
  • MEO 1854 was identified from a superpool screen for Mannitol tolerance as a line to assay under soil drought.
  • Table 3-1 Analysis of delay in desiccation in response to drought in two generations (T 2 and T 3 ) for two events of ME01854 after 11 da s of water de rivation.
  • ME00270 was identified from a superpool screen for ABA tolerance as a line to assay under soil drought.
  • Table 4-1 Analysis of delay in desiccation in response to drought in two generations (T 2 and T 3 ) for two events of ME00270 11 days after the last watering.
  • Plants transformed with the polynucleotides of the invention were also evaluated for any deleterious, negative or undesirable characteristics. Such characteristics include reduction in germination rate, modification of general morphology/architecture, changes in days to flowering, changes in the size of the plant rosette area after bolting, and changes in fertility (based, for example, on silique number of seed fill). For the observed plants, no statistically significant differences were noted between the transformed plants of the invention as compared to controls.
  • a subject sequence is considered a functional homolog of a query sequence if the subject and query sequences encode proteins having a similar function and/or activity.
  • a process known as Reciprocal BLAST (Rivera et al, Proc.Natl Acad Sci. USA ,1998, 95:6239-6244) is used to identify potential functional homolog sequences from databases consisting of all available public and proprietary peptide sequences, including NR from NCBI and peptide translations from Ceres clones.
  • a specific query polypeptide is searched against all peptides from its source species using BLAST in order to identify polypeptides having sequence identity of 80% or greater to the query polypeptide and an alignment length of 85% or greater along the shorter sequence in the alignment.
  • the query polypeptide and any of the aforementioned identified polypeptides are designated as a cluster.
  • the main Reciprocal BLAST process consists of two rounds of BLAST searches; forward search and reverse search. In the forward search step, a query polypeptide sequence, "polypeptide A,” from source species S A is BLASTed against all protein sequences from a species of interest.
  • Top hits are determined using an E- value cutoff of 10 " and an identity cutoff of 35%. Among the top hits, the sequence having the lowest E- value is designated as the best hit, and considered a potential functional homolog. Any other top hit that had a sequence identity of 80% or greater to the best hit or to the original query polypeptide is considered a potential functional homolog as well. This process is repeated for all species of interest.
  • the top hits identified in the forward search from all species are used to perform a BLAST search against all protein or polypeptide sequences from the source species S A .
  • a top hit from the forward search that returned a polypeptide from the aforementioned cluster as its best hit is also considered as a potential functional homolog.
  • Functional homologs are identified by manual inspection of potential functional homolog sequences. Representative functional homologs are shown in Figures 1 - 4. Each Figure represents a grouping of a lead/query sequence aligned with the corresponding identified functional homolog subject sequences. Lead sequences and their corresponding functional homolog sequences are aligned to identify conserved amino acids and to determine a consensus sequence that contains a frequently occurring amino acid residue at particular positions in the aligned sequences, as shown in Figures 1-4.
  • Each consensus sequence then is comprised of the identified and numbered conserved regions or domains, with some of the conserved regions being separated by one or more amino acid residues, represented by a dash (-), between conserved regions.
  • Useful polypeptides of the inventions therefore, include each of the lead and functional homolog sequences shown in Figures 1-4, as well as the consensus sequences shown in those Figures. The invention also encompasses other useful polypeptides constructed based upon the consensus sequence and the identified conserved regions. Thus, useful polypeptides include those which comprise one or more of the numbered conserved regions in each alignment table in an individual Figure depicted in Figures 1-4, wherein the conserved regions may be separated by dashes.
  • Useful polypeptides also include those which comprise all of the numbered conserved regions in an individual alignment table selected from Figures 1-4, alternatively comprising all of the numbered conserved regions in an individual alignment table and in the order as depicted in an individual alignment table selected from Figures 1-4.
  • Useful polypeptides also include those which comprise all of the numbered conserved regions in an individual alignment table and in the order as depicted in an individual alignment table selected from Figures 1-4, wherein the conserved regions are separated by dashes, wherein each dash between two adjacent conserved regions is comprised of the amino acids depicted in the alignment table for lead and/or functional homolog sequences at the positions which define the particular dash.
  • Such dashes in the consensus sequence can be of a length ranging from length of the smallest number of dashes in one of the aligned sequences up to the length of the highest number of dashes in one of the aligned sequences.
  • Such useful polypeptides can also have a length (a total number of amino acid residues) equal to the length identified for a consensus sequence or of a length ranging from the shortest to the longest sequence in any given family of lead and functional homolog sequences identified in an individual alignment table selected from Figures 1-4.
  • the present invention further encompasses nucleotides that encode the above described polypeptides, as well as the complements thereof, and including alternatives thereof based upon the degeneracy of the genetic code.

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Abstract

L'invention concerne des polynucléotides isolés et des polypeptides codés par ceux-ci, ainsi que l'utilisation de ces produits dans la fabrication de plantes transgéniques présentant une plus haute résistance au stress abiotique (par exemple, température élevée ou basse, sécheresse, inondations).
PCT/US2005/045780 2004-12-16 2005-12-16 Sequences nucleotidiques et polypeptides codes par celles-ci permettant d'ameliorer la resistance des plantes a la secheresse WO2006066134A2 (fr)

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CA002592919A CA2592919A1 (fr) 2004-12-16 2005-12-16 Sequences nucleotidiques et polypeptides codes par celles-ci permettant d'ameliorer la resistance des plantes a la secheresse
AU2005316360A AU2005316360A1 (en) 2004-12-16 2005-12-16 Nucleotide sequences and polypeptides encoded thereby useful for enhancing plant drought tolerance
BRPI0519520-9A BRPI0519520A2 (pt) 2004-12-16 2005-12-16 molÉcula de Ácido nuclÉico, vetor, mÉtodo para aumentar a tolerÂncia À estiagem em uma planta, produto alimentar, produto de raÇço e mÉtodo para detectar um Ácido nuclÉico em uma amostra
EP05854483A EP1831379A2 (fr) 2004-12-16 2005-12-16 Sequences nucleotidiques et polypeptides codes par celles-ci permettant d'ameliorer la resistance des plantes a la secheresse

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WO2013103366A1 (fr) 2012-01-06 2013-07-11 Pioneer Hi-Bred International, Inc. Procédé pour cribler des plantes pour des éléments génétiques induisant la parthénogenèse dans des plantes
CN103857693B (zh) * 2012-06-11 2016-12-21 创世纪种业有限公司 棉花的一个dreb1类转录因子及其编码基因与应用
US10851383B2 (en) 2003-10-14 2020-12-01 Ceres, Inc. Promoter, promoter control elements, and combinations, and uses thereof
US11634723B2 (en) 2003-09-11 2023-04-25 Ceres, Inc. Promoter, promoter control elements, and combinations, and uses thereof
US11739340B2 (en) 2003-09-23 2023-08-29 Ceres, Inc. Promoter, promoter control elements, and combinations, and uses thereof

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US20070006335A1 (en) * 2004-02-13 2007-01-04 Zhihong Cook Promoter, promoter control elements, and combinations, and uses thereof
US7655786B2 (en) 2006-03-15 2010-02-02 E.I. Du Pont De Nemours And Company Gene expression modulating element
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JP2024110396A (ja) * 2023-02-02 2024-08-15 国立研究開発法人農業・食品産業技術総合研究機構 アグロバクテリウム属細菌、アグロバクテリウム属細菌菌株、リゾビウム属細菌菌株、ダイズ栽培用処理剤、ダイズ栽培用土壌の製造方法、栽培用ダイズ種子の製造方法、及びダイズの栽培方法
CN120581076A (zh) * 2025-03-28 2025-09-02 湖南农业大学 一种筛选抗旱茶树种质的方法和应用

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Publication number Priority date Publication date Assignee Title
US11634723B2 (en) 2003-09-11 2023-04-25 Ceres, Inc. Promoter, promoter control elements, and combinations, and uses thereof
US11739340B2 (en) 2003-09-23 2023-08-29 Ceres, Inc. Promoter, promoter control elements, and combinations, and uses thereof
US10851383B2 (en) 2003-10-14 2020-12-01 Ceres, Inc. Promoter, promoter control elements, and combinations, and uses thereof
WO2007112326A1 (fr) * 2006-03-24 2007-10-04 Ceres, Inc. Promoteur, éléments de contrôle d'un promoteur, combinaisons et leur utilisations
WO2013103366A1 (fr) 2012-01-06 2013-07-11 Pioneer Hi-Bred International, Inc. Procédé pour cribler des plantes pour des éléments génétiques induisant la parthénogenèse dans des plantes
CN103857693B (zh) * 2012-06-11 2016-12-21 创世纪种业有限公司 棉花的一个dreb1类转录因子及其编码基因与应用

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US8049068B2 (en) 2011-11-01
EP1831379A2 (fr) 2007-09-12
AU2005316360A1 (en) 2006-06-22
BRPI0519520A2 (pt) 2009-02-10

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